axion-hdl 1.0.1

Automated AXI4-Lite Register Interface Generator for VHDL modules

Axion-HDL

AXI4-Lite register interfaces from VHDL, YAML, XML, or JSON. One command.

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Install

For users:

pip install axion-hdl

For development:

git clone https://github.com/bugratufan/axion-hdl.git
cd axion-hdl
python3 -m venv venv
source venv/bin/activate
pip install -e ".[dev]"  # Includes pytest, cocotb, etc.

Use

# From VHDL with @axion annotations
axion-hdl -s my_module.vhd -o output/

# From YAML/XML/JSON
axion-hdl -s registers.yaml -o output/

Output: VHDL module, C header, documentation, XML/YAML/JSON exports.

Define Registers

VHDL — embed in your code:

-- @axion_def BASE_ADDR=0x1000 CDC_EN
signal status  : std_logic_vector(31 downto 0); -- @axion RO
signal control : std_logic_vector(31 downto 0); -- @axion RW W_STROBE

YAML — standalone file:

module: my_module
base_addr: "0x1000"
config:
  cdc_en: true
registers:
  - name: status
    access: RO
  - name: control
    access: RW
    w_strobe: true

Features

• Multi-format input — VHDL annotations, YAML, XML, JSON
• CDC support — built-in clock domain crossing synchronizers
• Subregisters — pack multiple fields into one address
• Wide signals — auto-split 64-bit+ signals across addresses
• Tested — 230+ tests, GHDL simulation verified

Documentation

📖 axion-hdl.readthedocs.io

Development & Testing

Quick start:

git clone https://github.com/bugratufan/axion-hdl.git
cd axion-hdl
make test  # Auto-installs dependencies and runs all tests

The make test command automatically:

• Creates a virtual environment if needed
• Installs all test dependencies
• Runs 200+ tests (Python + VHDL + cocotb)

Manual setup (optional):

make setup-dev  # Create venv + install dependencies
source venv/bin/activate

CI/Automated environments:

AXION_AUTO_INSTALL=1 make test  # Skip prompt, auto-install

Contributing:

git checkout develop
git checkout -b feature/your-feature
# Make changes
make test  # Dependencies auto-installed on first run
# Submit PR to develop branch

License

MIT — Bugra Tufan